Shower tub back scrubber device



FIG. 1 is a front view of a shower tub back scrubber device showing my new design;

FIG. 2 is a rear view of the shower tub back scrubber device;

FIG. 3 is a side view of the shower tub back scrubber device;

FIG. 4 is a top view of the shower tub back scrubber device;

FIG. 5 is a bottom view of the shower tub back scrubber device; and,

FIG. 6 is a top front side perspective view of the shower tub back scrubber device. 

CLAIM The ornamental design for a shower tub back scrubber device, as shown and described. 